Photoluminescent markings with functional overlayers

• US 8,247,761 B1
• Filed: 10/19/2011
• Issued: 08/21/2012
• Est. Priority Date: 06/18/2009
• Status: Active Grant

• Current Assignee: Performance Indicator, LLC
• Original Assignee: Performance Indicator, LLC
• Inventors: Agrawal, Satish, Kingsley, Edward D.
• Primary Examiner(s): Kim, Kiho
• Application Number:
  US13/277,035
• Publication Number:
  US 20120205553A1
• Time in Patent Office: 307 Days
• Field of Search: 250/271, 2504911-4912
• US Class Current: 250/271
• CPC Class Codes: B41M 3/144 using fluorescent, luminescent or iridescent effects
• CPC Class Codes: B42D 25/378 Special inks
• CPC Class Codes: B42D 25/382 absorbing or reflecting infrared light
• CPC Class Codes: G06K 19/14 the marking being sensed by radiation
• CPC Class Codes: G06K 2019/06225 using wavelength selection, e.g. colour code
• CPC Class Codes: G07D 7/005 Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
• CPC Class Codes: G07D 7/1205 Testing spectral properties

Abstract

A photoluminescent marking that includes a photoluminescent layer and at least one functional overlayer is disclosed. The photoluminescent layer comprises at least one type of photoluminescent material. The at least one functional overlayer is adapted to selectively filter wavelengths of radiation to enhance the daylight observability of a final emission signature of the marking or to prevent the observability with the naked eye of a printed message on the marking. Also methods of making and using the inventive photoluminescent marking are disclosed.

Claims

1. A photoluminescent marking comprising:

a photoluminescent layer comprising at least one type of photoluminescent material; and

at least one functional overlayer disposed over at least the photoluminescent layer, the at least one functional overlayer being adapted to selectively filter wavelengths of radiation to enhance the daylight observability of a final emission signature of the marking.

2. The marking as in claim 1, wherein the at least one functional overlayer comprises at least one selectively reflective material adapted to reflect selected emissions from the at least one type of photoluminescent material back into the photoluminescent layer.

3. The marking as in claim 1, wherein the at least one functional overlayer comprises at least one selectively reflective material that is substantially transmissive of selected wavelengths.

4. The marking as in claim 1, wherein the selected wavelengths comprise at least one of infrared wavelengths, visible wavelengths, and ultraviolet wavelengths of electromagnetic radiation.

5. The marking as in claim 1, wherein the at least one type of photoluminescent material is at least one phosphorescent material, at least one fluorescent material, or any combination thereof.

6. The marking as in claim 1, wherein the at least one functional overlayer comprises at least one colorant.

7. The marking as in claim 1, wherein the at least one type of photoluminescent material comprises at least one high persistence phosphor.

8. The marking as in claim 1, wherein the final emission signature of the marking emits in at least one of an infrared, a visible, and an ultraviolet domain of the electromagnetic spectrum.

9. The marking as in claim 1, further comprising a reflective layer, said reflective layer redirects electromagnetic radiation to the viewing hemisphere.

10. A photoluminescent marking comprising:

a photoluminescent layer comprising at least one type of photoluminescent material; and

at least one functional overlayer disposed over at least the photoluminescent layer, the at least one functional overlayer being adapted to selectively filter wavelengths of radiation to prevent the observability with the naked eye of a printed message on the marking.

11. The marking as in claim 10, wherein the at least one functional overlayer comprises at least one colorant that absorbs selective wavelengths of radiation disposed over the printed message.

12. The marking as in claim 11, wherein the at least one colorant comprises at least one absorptive material.

13. The marking as in claim 11, wherein the at least one functional overlayer further comprises at least one selectively reflective material that is substantially transmissive of selected wavelengths.

14. The marking as in claim 10, wherein the at least one functional overlayer comprises at least one selectively reflective material adapted to reflect selected emissions from the at least one type of photoluminescent material back into the photoluminescent layer.

15. The marking as in claim 10, wherein the at least one functional overlayer comprises at least one selectively reflective material that is substantially transmissive of selected wavelengths.

16. The marking as in claim 10, wherein the at least one type of photoluminescent material is at least one phosphorescent material, at least one fluorescent material, or any combination thereof.

17. The marking as in claim 10, wherein the at least one type of photoluminescent material comprises at least one high persistence phosphor.

18. The marking as in claim 10, wherein the marking emits an emission signature that is in at least one of an infrared, a visible, and an ultraviolet domain of the electromagnetic spectrum.

19. The marking as in claim 10, further comprising a reflective layer, said reflective layer redirects electromagnetic radiation to the viewing hemisphere.

20. A method of fabricating a marking, the method comprising:

forming a photoluminescent layer comprising at least one type of photoluminescent material;

applying at least one functional overlayer to the photoluminescent layer, the at least one functional overlayer being adapted to selectively filter wavelengths of radiation; and

incorporating the photoluminescent layer and the at least one functional overlayer onto or into at least a portion of the marking.

21. The method as in claim 20, further comprising adapting the marking for association with an object.

22. The method as in claim 20, wherein the marking emits an emission signature that is in at least one of an infrared, a visible, and an ultraviolet domain of the electromagnetic spectrum.

23. The method as in claim 20, wherein forming comprises mixing the at least one type of photoluminescent material into a combination of at least one binder resin and at least one liquid carrier.

24. The method as in claim 20, wherein the at least one functional overlayer comprises at least one colorant.

25. The method as in claim 24, wherein the at least one colorant comprises at least one absorptive material.

26. The method as in claim 20, wherein the at least one functional overlayer comprises at least one selectively reflective material adapted to reflect selected emissions from the at least one type of photoluminescent material back into the photoluminescent layer.

27. The method as in claim 20, wherein the at least one functional overlayer comprises at least one selectively reflective material that is substantially transmissive of selected wavelengths.

28. The method as in claim 20, wherein the at least one type of photoluminescent material is at least one phosphorescent material, at least one fluorescent material, or any combination thereof.

29. The method as in claim 20, wherein the at least one type of photoluminescent material comprises at least one high persistence phosphor.

30. The method as in claim 20, further comprising incorporating at least one reflective layer onto or into at least a portion of the marking.

31. A method for marking an object, the method comprising:

applying a photoluminescent marking onto or into at least a portion of the object, the photoluminescent marking comprising a photoluminescent layer and at least one functional overlayer that is adapted to selectively filter wavelengths of radiation.

32. The method as in claim 31, wherein applying comprises at least one of incorporating the photoluminescent marking into the object during manufacture, building the photoluminescent marking on the object, and later affixing the photoluminescent marking to the object.

33. The method as in claim 31, wherein the photoluminescent marking further comprises at least one reflective layer.

34. A method for identifying an object, the method comprising:

detecting a potential emission signature from a photoluminescent marking previously applied onto or into at least a portion of the object, the photoluminescent marking comprising;

a photoluminescent layer, and

at least one functional overlayer that is adapted to selectively filter wavelengths of radiation, and

wherein the potential emission signature is subsequently compared to a known emission signature.

35. The method as in claim 34, wherein the photoluminescent marking is charged or activated on the object with at least one wavelength that is in at least one of an infrared, a visible, and an ultraviolet domain of the electromagnetic spectrum.

36. The method as in claim 34, wherein the photoluminescent marking is charged or activated on the object with at least one wavelength from at least one of a natural source and an artificial source.

37. The method as in claim 34, wherein detecting comprises observing the potential emission signature with a detection apparatus.

38. The method as in claim 34, wherein the photoluminescent marking further comprises at least one reflective layer.

39. The method as in claim 34, wherein the potential emission signature is in at least one of an infrared, a visible, and an ultraviolet domain of the electromagnetic spectrum.